Stain-resistant and dustproof coating for tunnel and preparation method of stain-resistant and dustproof coating

Abstract

The invention discloses a stain-resistant dustproof coating for tunnels. The coating is prepared from the following raw materials: deionized water, a pH regulator, a defoaming agent, hydroxypropyl methyl cellulose, a dispersing agent, a fluorescent whitening agent, fluorescent powder, anatase titanium dioxide, a coalescing agent, sepiolite fabric, potassium silicate, silica sol, titanium sol, conductive mica powder and a polyurethane thickening agent. The coating combines photocatalytic self-cleaning property and anti-static adsorption property, has antifouling, dustproof and self-cleaning effects, and reduces the influence of accumulation of dust on the surface of the coating on the incremental reflection function of the coating.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a tunnel stain-resistant and dust-proof coating. At the same time, the present invention also relates to a preparation method of the coating. Background Art

[0002] As an important part of modern transportation infrastructure, the operation safety and comfort of tunnels are of crucial importance. However, the environment inside the tunnel is relatively enclosed, and a large amount of pollutants such as dust and oil stains will be generated during the vehicle driving process. These pollutants adhere to the tunnel surface, which not only affects the beauty of the tunnel, but also reduces the lighting effect, increases energy consumption, and even causes corrosion damage to the tunnel structure. At present, the tunnel coatings on the market have certain limitations in terms of anti-pollution and dust-proof performance, and it is difficult to meet the long-term and efficient anti-pollution and dust-proof requirements. Therefore, developing a tunnel anti-pollution and dust-proof coating with excellent performance has important practical significance. In terms of safety and efficacy, good visual comfort inside the tunnel can also alleviate the "black hole" and "blind light" phenomena at the tunnel entrance and exit, improve driving safety and comfort, and have far-reaching significance for enhancing the operation efficiency and safety level of the entire transportation network. Summary of the Invention

[0003] The present invention provides a tunnel stain-resistant and dust-proof coating, which has excellent water resistance, high and low temperature resistance, A-level flame retardancy, and combines photocatalytic self-cleaning property with anti-static adsorption property, having an anti-pollution, dust-proof and self-cleaning effect, and reducing the influence of dust accumulation on the coating surface on the coating brightening function.

[0004] To achieve the above invention purpose, the present invention adopts the following technical solutions: A tunnel stain-resistant and dust-proof coating, the coating is composed of the following raw materials in parts by weight: deionized water 25 - 35 parts, PH regulator 0.1 - 0.2 part, defoamer 0.1 - 0.3 part, hydroxypropyl methylcellulose 0.2 - 0.3 part, dispersant 0.4 - 0.8 part, fluorescent brightener 1 - 2 parts, fluorescent powder 5 - 7 parts, anatase titanium dioxide 25 - 30 parts, film-forming aid 2 - 3 parts, sepiolite wool 3 - 4 parts, potassium silicate 15 - 19 parts, silica sol 8 - 12 parts, titanium sol 5 - 7 parts, conductive mica powder 3 - 4 parts, polyurethane thickener 0.3 - 0.5 part.

[0005] Further, the modulus of the potassium silicate is 3.85 - 4.35.

[0006] Further, the silica sol is a silane-modified silica sol.

[0007] Furthermore, the silane-modified silica sol is prepared from the following raw materials in parts by weight: 17-20 parts of tetraethyl orthosilicate, 65-80 parts of absolute ethanol, 56-58 parts of deionized water, 0.2-0.3 parts of KH550, and 0.4-0.6 parts of KH560.

[0008] Furthermore, the silane-modified silica sol is prepared by the following method: S1: Add 80% by weight of tetraethyl orthosilicate and absolute ethanol to a reaction flask, heat to 60°C, add 6-8 parts of deionized water thereto, dropwise add ammonia water to adjust the pH value to 8-9, and stir and react at 60°C for 2 h. Then add 50 parts of deionized water for dilution, heat to boiling, reflux and react to remove ethanol and ammonia gas to obtain a silica sol prepolymer. S2: Heat the silica sol prepolymer to boiling, dropwise add the remaining tetraethyl orthosilicate, and add ammonia water to adjust the pH value of the reaction solution to 8-9, and react at 60°C for 3 h. S3: Dropwise add KH550 and KH560 to modify the silica sol, and react at 60°C for 1 h to obtain the silane-modified silica sol.

[0009] Furthermore, the titanium sol is anatase-type nano-titanium dioxide sol.

[0010] Furthermore, the anatase-type nano-titanium dioxide sol is composed of the following raw materials in parts by weight: 6-9 parts of tetrabutyl titanate, 12-15 parts of acetylacetone, 65-75 parts of absolute ethanol, and 3-4 parts of deionized water.

[0011] Furthermore, the anatase-type nano-titanium dioxide sol is prepared by the following method: Add tetrabutyl titanate, absolute ethanol, and acetylacetone to a reactor, heat to 60°C, dropwise add ammonia water to adjust the pH value to 8-10, dropwise add deionized water, and stir and react at 60°C for 3 h to obtain the anatase-type nano-titanium dioxide sol.

[0012] The above-mentioned tunnel stain-resistant and dust-proof coating is prepared by the following method: Add deionized water, pH regulator, defoamer, hydroxypropyl methylcellulose, and dispersant to a reaction kettle, stir at 1800 r / min for 15 min, add fluorescent brightener, fluorescent powder, anatase titanium dioxide, sepiolite wool, conductive mica powder, stir at 1800 r / min for 30 min, reduce the stirring speed to 600 r / min, add film-forming aid, potassium silicate, silica sol, titanium sol, and polyurethane thickener, and stir evenly to obtain the tunnel stain-resistant and dust-proof coating.

[0013] The tunnel stain-resistant and dust-proof coating of the present invention uses inorganic resins potassium silicate, silica sol, and titanium sol as the main film-forming resins. The coating has excellent water resistance, abrasion resistance, freeze-thaw resistance, and high-temperature resistance. It has Class A flame retardancy and mildew-proof effect when applied to tunnels. Moreover, this coating combines photocatalytic self-cleaning property with anti-static adsorption property, having the effect of anti-pollution, dust-proof, and self-cleaning, reducing the influence of dust accumulation on the coating surface on the whitening and brightening effect of the coating, and having the long-term effect of dust-proof and brightening. Detailed Embodiments

[0014] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] The weight parts of each raw material of the tunnel stain-resistant and dust-proof coatings in Examples 1 to 3 and Comparative Examples 1 to 5 are shown in Table 1 below: Table 1 Raw materials Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Deionized water 25 35 30 30 30 30 30 30 pH regulator 0.1 0.2 0.1 0.1 0.1 0.1 0.1 0.1 Defoamer 0.1 0.3 0.2 0.2 0.2 0.2 0.2 0.2 Hydroxypropyl methylcellulose 0.2 0.3 0.2 0.2 0.2 0.2 0.2 0.2 Dispersant 0.4 0.8 0.6 0.6 0.6 0.6 0.6 0.6 Fluorescent brightening agent 1 2 1.5 0 1.5 1.5 1.5 1.5 Phosphor 5 7 6 3 6 6 6 6 Anatase titanium dioxide 25 30 27 31.5 27 (rutile titanium dioxide) 27 30.5 30.5 Sepiolite wool 3 4 3.5 3.5 3.5 3.5 3.5 0 Conductive mica powder 3 4 3.5 3.5 3.5 3.5 0 3.5 Film-forming aid 2 3 2.5 2.5 2.5 2.5 2.5 2.5 Potassium silicate 15 19 17 17 17 23 17 17 Silica sol 8 (Resin a) 12 (Resin b) 10 (Resin c) 10 (Resin c) 10 (Resin c) 10 (Resin c) 10 (Resin c) 10 (Resin c) Titanium sol 5 (Resin d) 7 (Resin e) 6 (Resin f) 6 (Resin f) 6 (Resin f) 0 6 (Resin f) 6 (Resin f) Polyurethane thickener 0.3 0.5 0.4 0.4 0.4 0.4 0.4 0.4 The modulus of the above potassium silicate is 3.85 - 4.35. The formula of the above silica sol is shown in Table 2 below, and is represented by resin a, resin b, and resin c respectively.

[0016] Table 2 Raw materials Resin a Resin b Resin c Tetraethyl orthosilicate 17 18 20 Absolute ethanol 65 75 80 Deionized water 56 57 58 KH550 0.2 0 0.3 KH560 0.6 0 0.4 The above silane-modified silica sol is prepared by the following method: S1: Add 80% by weight of tetraethyl orthosilicate and absolute ethanol to a reaction flask, heat to 60°C, add 6 - 8 parts of deionized water thereto, dropwise add ammonia water to adjust the pH value to 8 - 9, and stir and react at 60°C for 2 h. Then add 50 parts of deionized water for dilution, heat to boiling, and carry out reflux reaction to remove ethanol and ammonia gas to obtain a silica sol prepolymer; S2: Heat the silica sol prepolymer to boiling, dropwise add the remaining tetraethyl orthosilicate, and add ammonia water to adjust the pH value of the reaction solution to 8 - 9, and react at 60°C for 3 h; S3: Dropwise add KH550 and KH560 to modify the silica sol, and react at 60°C for 1 h to obtain the silane-modified silica sol.

[0017] The above titanium sol is anatase-type nano-titanium dioxide sol. The formula of the above titanium sol is shown in Table 3 below, and is represented by resin d, resin e, and resin f respectively.

[0018] Table 3 Raw materials Resin d Resin e Resin f n-Butyl titanate 6 9 7 Absolute ethanol 65 75 70 Acetylacetone 12 15 13 Deionized water 3 4 3.5 The above anatase-type nano-titanium dioxide sol is prepared by the following method: Add tetrabutyl titanate, absolute ethanol, and acetylacetone into the reactor, heat up to 60 °C, dropwise add ammonia water to adjust the pH value to 8 - 10, dropwise add deionized water, and stir and react at 60 °C for 3 h to obtain anatase-type nano-titanium dioxide sol.

[0019] The above-mentioned tunnel stain-resistant and dust-proof coating is prepared by the following method: Add deionized water, pH regulator, defoamer, hydroxypropyl methylcellulose, and dispersant into the reaction kettle, stir at 1800 r / min for 15 min, add fluorescent brightener, fluorescent powder, anatase titanium dioxide, sepiolite wool, conductive mica powder, stir at 1800 r / min for 30 min, reduce the stirring speed to 600 r / min, add film-forming aid, potassium silicate, silica sol, titanium sol, and polyurethane thickener, and stir evenly to obtain the tunnel stain-resistant and dust-proof coating.

[0020] Perform relevant performance tests on the tunnel stain-resistant and dust-proof coatings of Examples 1 - 3 and Comparative Examples 1 - 5. The specific test results are shown in Table 4 below.

[0021] Table 4 Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 State in the container Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring Uniform and without lumps after stirring <![CDATA[Acid resistance / (240h) 10% H₂SO₄ solution]]> No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality Alkali resistance / (240h) saturated calcium hydroxide solution No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality Water resistance / 10d No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality Combustion performance Grade A Grade A Grade A Grade A Grade A Grade A Grade A Grade A Coating temperature resistance change (10 cycles) No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality Surface resistivity (Ω) <![CDATA[10 8 > <![CDATA[10 7 > <![CDATA[10 8 > <![CDATA[10 7 > <![CDATA[> 10 12 > <![CDATA[> 10 12 > <![CDATA[10 10 > <![CDATA[10 8 > Mildew resistance Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Humidity and heat resistance / d The 10d coating has no cracking, no blistering, and no wrinkling The 10d coating has no cracking, no blistering, and no wrinkling The 10d coating has no cracking, no blistering, and no wrinkling The 10d coating has no cracking, has blistering, and has wrinkling The 10d coating has no cracking, has blistering, and has wrinkling The 10d coating has no cracking, has blistering, and has wrinkling The 10d coating has no cracking, no blistering, and no wrinkling The 10d coating has no cracking, no blistering, and no wrinkling Scrub resistance (times) ＞5000 ＞2000 ＞5000 ＞5000 ＞5000 ＞5000 ＞5000 ＞2000 Freeze-thaw cycle resistance / times After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling After 15 cycles, the coating has no blistering, no wrinkling, and no peeling Stain resistance 6% 5% 6% 6% 11% 9% 7% 8% Reflectivity % 98 99 98 96 99 98 98 98 Reflectivity % after dry powder (fly ash) pollution 96 97 96 95 89 90 91 96 Artificial aging resistance No blistering, no cracking, and no peeling after 1000h No blistering, no cracking, and no peeling after 1000h No blistering, no cracking, and no peeling after 1000h No blistering, no cracking, and no peeling after 1000h No blistering, no cracking, and no peeling after 1000h No blistering, no cracking, and no peeling after 1000h No bubbling, cracking or peeling after 1000h No bubbling, cracking or peeling after 1000h Measurement of reflectance after dry powder (fly ash) pollution: Sprinkle fly ash dry powder evenly on the surface of the dry sample coating, hold up the sample and shake off the fly ash on the coating surface, and use a reflectance measuring instrument to measure the reflectance of the coating surface.

[0022] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tunnel anti-fouling and dust-proof coating, characterized in that: The coating is composed of the following raw materials in parts by weight: 25-35 parts of deionized water, 0.1-0.2 parts of pH regulator, 0.1-0.3 parts of defoaming agent, 0.2-0.3 parts of hydroxypropyl methylcellulose, 0.4-0.8 parts of dispersant, 1-2 parts of fluorescent brightener, 5-7 parts of fluorescent powder, 25-30 parts of anatase titanium dioxide, 2-3 parts of film-forming aid, 3-4 parts of sepiolite, 15-19 parts of potassium silicate, 8-12 parts of silica sol, 5-7 parts of titanium sol, 3-4 parts of conductive mica powder and 0.3-0.5 parts of polyurethane thickener.

2. The tunnel anti-fouling and anti-dust coating according to claim 1, characterized in that: The modulus of the potassium silicate is 3.85-4.

35.

3. The tunnel anti-fouling and anti-dust coating according to claim 1, characterized in that: The silica sol is silane-modified silica sol.

4. The anti-fouling and anti-dust coating for tunnels according to claim 3, characterized in that: The silane-modified silica sol is prepared from the following raw materials in parts by weight: 17-20 parts of ethyl orthosilicate, 65-80 parts of anhydrous ethanol, 56-58 parts of deionized water, 0.2-0.3 parts of KH550, and 0.4-0.6 parts of KH560.

5. The anti-fouling and anti-dust coating for tunnels according to claim 4, characterized in that: The silane-modified silica sol is prepared by the following method: S1: Add 80% by weight of ethyl orthosilicate and anhydrous ethanol into a reaction bottle, heat to 60°C, and add 6-8 parts of deionized water. Ammonia water was added dropwise to adjust the pH value to 8-9, and the mixture was stirred and reacted at 60°C for 2 hours, and then 50 parts of deionized water were added for dilution, heated to boiling, and refluxed to remove ethanol and ammonia to obtain a silica sol prepolymer; S2: Heat the silica sol prepolymer to boiling, add the remaining ethyl orthosilicate dropwise, and add ammonia water to adjust the pH value of the reaction solution to 8-9, and react at 60°C for 3h; S3: KH550 and KH560 were added dropwise to modify the silica sol, and the reaction was carried out at 60° C. for 1 h to obtain silane-modified silica sol.

6. The anti-fouling and anti-dust coating for tunnels according to claim 1, characterized in that: The titanium sol is anatase type nano titanium dioxide sol.

7. The anti-fouling and anti-dust coating for tunnels according to claim 6, characterized in that: The anatase nano titanium dioxide sol is composed of the following raw materials in parts by weight: 6-9 parts of n-butyl titanate, 12-15 parts of acetylacetone, 65-75 parts of anhydrous ethanol, and 3-4 parts of deionized water.

8. The anti-fouling and anti-dust coating for tunnels according to claim 7, characterized in that: The anatase nano titanium dioxide sol is prepared by the following method: Add n-butyl titanate, anhydrous ethanol, and acetylacetone into the reactor, raise the temperature to 60°C, add ammonia water dropwise to adjust the pH value to 8-10, add deionized water dropwise, and stir the reaction at 60°C for 3 hours to obtain anatase nano-titanium dioxide sol.

9. A method for preparing a tunnel anti-fouling and anti-dust coating as claimed in any one of claims 1 to 8, characterized in that: The tunnel anti-fouling and anti-dust coating is prepared by the following method: Add deionized water, pH regulator, defoaming agent, hydroxypropyl methylcellulose and dispersant into the reactor, stir at 1800 r / min for 15 min, add fluorescent brightener, fluorescent powder, anatase titanium dioxide, sepiolite wool, conductive mica powder, stir at 1800 r / min for 30 min, reduce the stirring speed to 600 r / min, add film-forming aid, potassium silicate, silica sol, titanium sol, polyurethane thickener, stir evenly to obtain the tunnel pollution-resistant and dust-proof coating.